Table 3.

Airflow reduction index.

	Airflow reduction events (count)	Total sleep time (minutes)	Airflow reduction index (events/hr ± SD)	p  valuea
Overall	1606	8044	12.0 ± 1.3
Sleep stage
NREM	1410	7158.3	11.8 ± 1.4	0.37
REM	196	885.7	13.3 ± 1.5
Pregnancy status
Healthy	815	4139.3	11.8 ± 1.1	0.68
GH	791	3904.7	12.2 ± 1.6

^a t-test comparison of means. GH, gestational hypertension; NREM, nonrapid eye movement; REM, rapid eye movement; SD, standard deviation.